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New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study

Background: Mismatch of intramedullary nails with the bowing of femur is a frequent clinical finding. Previous studies showed inconsistent results. Methods: We present an algorithm of region growing territory method to get the radii of the anterior bowing of femur. We also tested it on ten radiograp...

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Autores principales: Liaw, Chen-Kun, Chen, Yen-Po, Wu, Tai-Yin, Fuh, Chiou-Shann, Chang, Ruey-Feng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832379/
https://www.ncbi.nlm.nih.gov/pubmed/31623300
http://dx.doi.org/10.3390/jcm8101598
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author Liaw, Chen-Kun
Chen, Yen-Po
Wu, Tai-Yin
Fuh, Chiou-Shann
Chang, Ruey-Feng
author_facet Liaw, Chen-Kun
Chen, Yen-Po
Wu, Tai-Yin
Fuh, Chiou-Shann
Chang, Ruey-Feng
author_sort Liaw, Chen-Kun
collection PubMed
description Background: Mismatch of intramedullary nails with the bowing of femur is a frequent clinical finding. Previous studies showed inconsistent results. Methods: We present an algorithm of region growing territory method to get the radii of the anterior bowing of femur. We also tested it on ten radiographs. Plain radiographs of the lateral view of femur from five men and five women taken between January and August 2014 in Taipei Hospital were chosen randomly. The curvature of femur outline and medullary canal were measured for three times each. Radii of curvature of whole femur, proximal, middle and distal parts were calculated and analyzed. Results: The coefficient of variation of the 240 measurements ranged from 0.007 to 0.295 and averaged 0.088. The average radii of curvature of the whole, proximal, middle, and distal femur were 1318 mm, 752 mm, 1379 mm, and 599 mm, respectively. At the distal part of the femur, the radius of curvature of the femur outline (452 mm) was smaller than the medullary canal (746 mm) (p < 0.05). Women’s femur was straighter than men’s when we compared the whole length (1435 mm vs. 1201 mm, p < 0.05). The radii we calculated were smaller than the current intramedullary nails. Conclusion: The results showed that the inter-observer and intra-observer differences are acceptable, support the impression that different bowing conditions existed for Asians as compared to Caucasians, and also indicate the mismatch of current instruments to the curvature of femur.
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spelling pubmed-68323792019-11-21 New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study Liaw, Chen-Kun Chen, Yen-Po Wu, Tai-Yin Fuh, Chiou-Shann Chang, Ruey-Feng J Clin Med Article Background: Mismatch of intramedullary nails with the bowing of femur is a frequent clinical finding. Previous studies showed inconsistent results. Methods: We present an algorithm of region growing territory method to get the radii of the anterior bowing of femur. We also tested it on ten radiographs. Plain radiographs of the lateral view of femur from five men and five women taken between January and August 2014 in Taipei Hospital were chosen randomly. The curvature of femur outline and medullary canal were measured for three times each. Radii of curvature of whole femur, proximal, middle and distal parts were calculated and analyzed. Results: The coefficient of variation of the 240 measurements ranged from 0.007 to 0.295 and averaged 0.088. The average radii of curvature of the whole, proximal, middle, and distal femur were 1318 mm, 752 mm, 1379 mm, and 599 mm, respectively. At the distal part of the femur, the radius of curvature of the femur outline (452 mm) was smaller than the medullary canal (746 mm) (p < 0.05). Women’s femur was straighter than men’s when we compared the whole length (1435 mm vs. 1201 mm, p < 0.05). The radii we calculated were smaller than the current intramedullary nails. Conclusion: The results showed that the inter-observer and intra-observer differences are acceptable, support the impression that different bowing conditions existed for Asians as compared to Caucasians, and also indicate the mismatch of current instruments to the curvature of femur. MDPI 2019-10-03 /pmc/articles/PMC6832379/ /pubmed/31623300 http://dx.doi.org/10.3390/jcm8101598 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liaw, Chen-Kun
Chen, Yen-Po
Wu, Tai-Yin
Fuh, Chiou-Shann
Chang, Ruey-Feng
New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title_full New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title_fullStr New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title_full_unstemmed New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title_short New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph—A Validation Study
title_sort new computerized method in measuring the sagittal bowing of femur from plain radiograph—a validation study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832379/
https://www.ncbi.nlm.nih.gov/pubmed/31623300
http://dx.doi.org/10.3390/jcm8101598
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